IMPORTANT: We currently have a number of bugs related to image cropping and are actively trying to resolve them. In the meantime, we have disabled cropping. Apologies for any inconvenience. Stay informed: radiopaedia.org/chat

Lateral patellar dislocation injury with detached osteochondral fracture

Case contributed by Mohamed El Deen
Diagnosis certain

Presentation

Patient came on a wheelchair suffering from right knee joint pain post accidental falling down at home x 1 day.

Patient Data

Age: 16 years
Gender: Female

Chip avulsion fracture of the patella with joint effusion.

Absence of articular cartilage at the medial patellar facet, with mild subjacent bone marrow edema and a small (1.4 cm linear ) floating osteochondral fragment within the medial knee gutter.

Lateral femoral condyle bone marrow edema "contusion".

Medial patellar retinaculum injury with lateral patellar displacement.

Grade I proximal MCL injury.

Large knee joint effusion is noted with fluid/fluid level (hemarthrosis).

Muscle edema and contusions in vastus lateralis and medialis.

Rest of the visualized other extensor mechanism structures are preserved. Lateral collateral complex and cruciate ligaments are preserved. Menisci are unremarkable.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.